Messages in this thread | | | From | Andi Kleen <> | Subject | Re: Fw: 2.6.16 crashes when running numastat on p575 | Date | Mon, 3 Apr 2006 13:49:02 +0200 |
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On Monday 03 April 2006 07:15, Paul Jackson wrote: > - for (cpu = 0; cpu < NR_CPUS; cpu++) { > + for_each_online_cpu(cpu) { > > Idle curiosity -- what keeps a cpu from going offline during > this scan, and leaving us with the same crash as before?
CPU hotdown uses RCU like techniques to avoid this. Only potential problem could be on a preemptive kernel, but I hope nobody tries cpu unplug on such a beast. The later could be probably fixed with a rcu_read_lock() or somesuch.
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